如何用金属改造平坦的屋顶

金属以其耐用性，对天气的抵抗力，低维护成本，提高能源效率，寿命和易于安装而闻名。由于其巨大的好处，金属通常用于retrofitting a low slope or flat roof.

在开始新设计之前metal retrofit system，您必须考虑要恢复的原始屋顶材料。

低坡或平坦的屋顶通常属于几个类别之一：建筑风格（加固的织物的交替层，顶部有砾石沥青），改良的沥青或单层橡胶膜。当前使用的最常见的低坡度屋顶材料是修改的沥青和单层。

改造带有金属的低坡屋顶

有两种方法可以接近使用金属改造an existing low slope or flat roof: a compact retrofit system or a frame-up retrofit system. A compact retrofit system is created by attaching a new metal roof directly over the top of the existing roofing system; the existing building slope remains the same and only a minimal amount of additional height or framing is added to the building.

A frame-up retrofit system is created by installing a new frame on top of the old roof and attaching the new structural members to the structure below to increase the roof slope. In either case, a structural roof system designed for installation over open framing is required, and standing seam roof systems are best for keeping the system watertight.

Standing Seam System for Flat Roof Retrofit

Of the structural panels available, the symmetrical, T shaped,vertical ribbed standing seam like McElroy Metal’s 238T在安装后，提供最高的风向隆起能力，最水密的接缝设计，最重要的是，可以拆除和更换屋顶田地任何地方的单个面板。

鉴于安装后修复单个面板的能力非常重要galvalume coated steelis projected to last 50 to 60 years. Although metal is an extremely durable roofing system, there is a lot that can happen to a roof over that time frame.

When choosing which type of retrofit will be a good fit for your building, the roof slope and gutter system of the existing building should be considered. A compact retrofit system can be used if there is a consistent minimum of ¼” per foot slope built into the structure and external gutters.

在下面的照片中，新屋顶直接连接在现有屋顶上，并连接到下面的甲板或结构。像其他任何重新屋顶项目一样，必须更换湿隔离或腐烂，损坏的木材也必须更换。进行紧凑的改造系统的优点之一是，您不必为当前的能源代码提供构建。

当前的能源法规需要在所有新结构上进行一定量的绝缘材料，并“删除和更换”屋顶项目；通常，这种隔热需求超出现有建筑物的安装，需要额外的绝缘材料。这可能会非常繁重，并且可能会变得昂贵。恢复屋顶是代码的例外之一，因此除非建筑物所有者要求它，否则不需要。

Frame-Up Flat Roof Retrofit

The second type of retrofit, a frame-up retrofit, is often used to increase the slope of the existing roof and is also often used to change the rainwater flow of the original building. It is not uncommon for flat roof buildings to use gutter systems that are internal to the building.

如果失败，这些系统可能会对整个建筑物（及其内容）造成昂贵的损坏。框架改造可以重新布线雨水流，以使水进入建筑物的外部，如果超载过载，则造成损坏的可能性要小得多。

Frame-up retrofits also offer a variety of aesthetic choices for your building. If you want the benefits of a metal roof without changing the overall appearance of the building, the new roof can be pitched as low as ¼” on 12”.

You can also increase the pitch or slope of the new roof to eliminate roof leak problems and create a new look for the building or hide unappealing rooftop mechanical equipment.

Regardless of the retrofit system type you choose, the new roof will require rigid attachment into the building structure.beplay在线下载recommends that a local structural engineer be brought in to evaluate the existing structure for suitability and to determine the best method of attachment of the new roof to the existing structure.

现有的结构可以是条托梁，purins，灯泡T恤或结构混凝土甲板。结构的方向，间距，仪表和深度都将决定附着的方法。完成此操作后，设计过程就可以开始。

借助紧凑和框架系统，在需要时，可以在现场制造新的屋顶面板，从而使一个面板从屋檐到山脊或工厂运行并运到工作现场。

对于由长面板运行组成的屋顶，将需要面板圈将多个面板缝合在一起以创建一个长面板。面板圈不仅安装昂贵，而且通常是任何屋顶系统中最弱的连接；因此，避免使用现场卷的形成通常是有利的，这会从屋檐到山脊创建一个单一的面板并产生最好的可用改造屋顶系统for your building.